U.S. patent application number 11/280443 was filed with the patent office on 2006-06-22 for display apparatus.
This patent application is currently assigned to Samsung Electronics Co., Ltd.. Invention is credited to Young-chan Kim.
Application Number | 20060132437 11/280443 |
Document ID | / |
Family ID | 36595047 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060132437 |
Kind Code |
A1 |
Kim; Young-chan |
June 22, 2006 |
Display apparatus
Abstract
A display apparatus for communicating with a computer main body
through a DPVL system, wherein the display apparatus is provided
with a video signal processor to process a video signal output from
a computer main body into a displayable video signal, a frame
buffer to store frame information corresponding to the video
signal, and a controller to control the video signal processor to
display a picture based on the frame information stored in the
frame buffer when a predetermined shutdown signal is output from
the computer main body, and change the picture on the basis of the
stored frame information when a predetermined period has elapsed
after receiving the shutdown signal. Thus, the present invention
provides a display apparatus in which an image sticking phenomenon
is decreased, wasteful power consumption is reduced, and which can
prevent a user from being confused while the display apparatus
continuously displays a still picture.
Inventors: |
Kim; Young-chan; (Uiwang-si,
KR) |
Correspondence
Address: |
ROYLANCE, ABRAMS, BERDO & GOODMAN, L.L.P.
1300 19TH STREET, N.W.
SUITE 600
WASHINGTON,
DC
20036
US
|
Assignee: |
Samsung Electronics Co.,
Ltd.
|
Family ID: |
36595047 |
Appl. No.: |
11/280443 |
Filed: |
November 17, 2005 |
Current U.S.
Class: |
345/157 |
Current CPC
Class: |
G09G 2320/046 20130101;
G09G 3/007 20130101; G09G 2330/022 20130101; G09G 2360/18 20130101;
G09G 5/006 20130101; G09G 2330/021 20130101 |
Class at
Publication: |
345/157 |
International
Class: |
G09G 5/08 20060101
G09G005/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 20, 2004 |
KR |
10-2004-0108896 |
Claims
1. A display apparatus for communicating with a computer main body
through a digital packet video link (DPVL) system, the display
apparatus comprising: a video signal processor to process a video
signal output from a computer main body into a displayable video
signal; a frame buffer to store frame information corresponding to
the video signal; and a controller to control the video signal
processor to display a picture based on the frame information
stored in the frame buffer when a predetermined shutdown signal is
output from the computer main body, and change the picture on the
basis of the stored frame information when a predetermined period
has elapsed after receiving the shutdown signal.
2. The display apparatus according to claim 1, wherein the
controller is further programmable to: control the video signal
processor to display the picture based on the frame information
stored in the frame buffer when the predetermined shutdown signal
is output from the computer main body; and move the picture by a
predetermined width when a predetermined period has elapsed after
receiving the shutdown signal.
3. The display apparatus according to claim 2, further comprising:
a key input part to allow a user to input a key; and an on screen
display (OSD) generator to generate a position movement menu
allowing a user to select a position movement function for the
picture, and to further allow a user to set the predetermined
period for implementing the position movement function, wherein the
controller is further programmable to control the OSD generator to
display the position movement menu when the position movement
function is selected through the key input part, and store setting
information that is set through the position movement menu by
manipulating the key input part.
4. The display apparatus according to claim 3, wherein the
controller is further programmable to: control the video signal
processor to move the position of the displayed picture by a
predetermined width after a lapse of the predetermined period;
count the predetermined period; and control the video signal
processor to move the position of the displayed picture again after
a lapse of the predetermined period.
5. The display apparatus according to claim 1, wherein the
controller is further programmable to: control the video signal
processor to display the picture based on the frame information
stored in the frame buffer when the shutdown signal is input; and
blink the displayed picture per a predetermined cycle after the
predetermined period has elapsed.
6. A display apparatus for communicating with a computer main body
through a digital packet video link (DPVL) system, the display
apparatus comprising: a video signal processor to process a video
signal output from a computer main body into a displayable video
signal; a frame buffer to store frame information corresponding to
the video signal; a power supply to supply power to the display
apparatus; and a controller to control the video signal processor
to display a picture based on the frame information stored in the
frame buffer when a predetermined shutdown signal is output from
the computer main body, and control the power supply to interrupt
the power supplied to the display apparatus when a predetermined
period has elapsed after receiving the shutdown signal to enter a
power saving mode.
7. The display apparatus according to claim 6, further comprising:
a key input part to allow a user to input a key; and an on screen
display (OSD) generator to generate a power saving function menu
allowing a user to select the power saving mode, and to further
allow a user to set the predetermined period for implementing the
power saving mode, wherein the controller is further programmable
to control the OSD generator to display the power saving function
menu when the power saving mode is selected through the key input
part, and store setting information that is set through the power
saving function menu by manipulating the key input part.
8. The display apparatus according to claim 7, wherein the OSD
generator is configured to: generate a message to indicate whether
the display apparatus is in the shutdown state and inform a user of
a time remaining before entering the power saving mode; and the
controller is further programmable to control the OSD generator to
display the message when a query relating to a current state of the
display apparatus is received through the key input part while the
display apparatus receives the shutdown signal and displays the
picture based on the frame information stored in the frame
buffer.
9. A display apparatus for communicating with a computer main body
through a digital packet video link (DPVL) system, the display
apparatus comprising: a video signal processor to process a video
signal output from a computer main body into a displayable video
signal; a frame buffer to store frame information corresponding to
the video signal; an on screen display (OSD) generator to generate
a shutdown message to indicate a shutdown state; a key input part
to allow a user to input a key; and a controller to control the OSD
generator to display the shutdown message when a query relating to
a current state of the display apparatus is received through the
key input part while the display apparatus receives the shutdown
signal from the computer main body and displays a picture based on
the frame information stored in the frame buffer.
10. The display apparatus according to claim 9, wherein the OSD
generator is configured to: generate a shutdown entering message to
indicate entering the shutdown state; and the controller is further
programmable to control the OSD generator to display the shutdown
entering message for a predetermined period of time when the
shutdown signal is output from the computer main body.
11. A method for controlling a communication between a display
apparatus and a computer main body through a digital packet video
link (DPVL) system, comprising: processing a video signal output
from a computer main body into a displayable video signal; storing
frame information corresponding to the video signal; and displaying
a picture based on the frame information when a predetermined
shutdown signal is output from the computer main body, and changing
the picture on the basis of the stored frame information when a
predetermined period has elapsed after receiving the shutdown
signal.
12. The method according to claim 11, further comprising:
displaying the picture based on the frame information when the
predetermined shutdown signal is output from the computer main
body; and moving the picture by a predetermined width when a
predetermined period is elapsed after receiving the shutdown
signal.
13. The method according to claim 12, further comprising:
generating a position movement menu for allowing a user to select a
position movement function for the picture and for setting the
predetermined period for implementing the position movement
function; and displaying the position movement menu when the
position movement function is selected and storing setting
information that is set through the position movement menu.
14. The method according to claim 13, further comprising: moving
the position of the displayed picture by a predetermined width
after a lapse of the predetermined period; counting the
predetermined period; and moving the position of the displayed
picture again after a lapse of the predetermined period.
15. The method according to claim 11, further comprising:
displaying the picture based on the frame information when the
shutdown signal is input; and blinking the displayed picture per a
predetermined cycle after the predetermined period has elapsed.
16. The method according to claim 11, further comprising:
interrupting a power supplied to the display apparatus when a
predetermined period has elapsed after receiving the shutdown
signal to enter a power saving mode.
17. The method according to claim 11, further comprising:
displaying a shutdown message when a query relating to a current
state of the display apparatus is received while the display
apparatus receives the shutdown signal from the computer main body
and displays a picture based on the frame information stored.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit under 35 U.S.C.
.sctn.119(a) of Korean Patent Application No. 10-2004-0108896,
filed in the Korean Intellectual Property Office on Dec. 20, 2004,
the entire disclosure of which is incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a display apparatus for
supporting a digital packet video link (DPVL) system. More
particularly, the present invention relates to a display apparatus
which can decrease an image sticking phenomenon arising in a
shutdown state when displaying a still picture as a shutdown signal
is transmitted from a computer main body to the display apparatus.
The present invention can further reduce wasteful power
consumption, and offer various messages to prevent a user from
being confused as to the operation being performed.
[0004] 2. Description of the Related Art
[0005] In conventional computer systems, a digital packet video
link (DPVL) is often employed in a communication system between a
computer main body and a display apparatus so as to improve limited
transmission speed in transmitting a large amount of high
resolution video data to the display apparatus.
[0006] When the video data is transmitted from the computer main
body that supports the DPVL system to the display apparatus, the
computer main body recognizes a changed part of the current video
data from the previous video data, and makes packet data for only
the changed part of the current video data. The computer main body
can then transmit the packet data to the display apparatus.
Therefore, the display apparatus displays a picture, and partially
changes the picture only when the changes correspond to the
received packet data. Thus, the transmission speed that is limited
due to the large amount of video data can be improved.
[0007] When the computer main body supporting the DPVL system
enters a link shutdown state, power saving mode or power-off state,
the computer main body outputs a shutdown signal to the display
apparatus. When the conventional display apparatus receives the
shutdown signal, the display apparatus continuously displays a
picture corresponding to the immediately preceding video data
stored in a frame buffer, thereby providing a user with a still
picture.
[0008] However, such a conventional display apparatus supporting
the DPVL communication system continuously displays the still
picture when it receives the shutdown signal from the computer main
body, such that any number of operation problems can arise. For
example, an image sticking (or afterimage) phenomenon can arise,
thereby deteriorating picture quality of the display apparatus.
Further, even though there is no video data transmitted from the
computer main body, the display apparatus continuously operates,
thereby wastefully consuming power. Also, in the case where the
conventional display apparatus supporting the DPVL communication
system continuously displays the still picture in response to the
shutdown signal, it is difficult for a user to distinguish whether
the display apparatus is displaying the still picture due to
continuously receiving the same video data from the computer main
body, or due to receiving the video data stored in the frame buffer
without receiving the video data from the computer main body in
response to the shutdown signal.
[0009] Accordingly, a need exists for a display apparatus and
control method in which the aforementioned image sticking
phenomenon is decreased, wasteful power consumption is reduced, and
which can prevent a user from being confused while the display
apparatus continuously displays a still picture.
SUMMARY OF THE INVENTION
[0010] Accordingly, it is an aspect of the present invention to
provide a display apparatus in which an image sticking phenomenon
is decreased while the display apparatus continuously displays a
still picture in response to a shutdown signal transmitted from a
computer main body.
[0011] Another aspect of the present invention is to provide a
display apparatus in which wasteful power consumption is reduced
while the display apparatus continuously displays a still picture
in response to a shutdown signal transmitted from a computer main
body.
[0012] Still another aspect of the present invention is to provide
a display apparatus which can prevent a user from being confused as
to the operation being performed while the display apparatus
continuously displays a still picture in response to a shutdown
signal transmitted from a computer main body.
[0013] Additional aspects and advantages of the present invention
will be set forth, in part in the description which follows and, in
part will be obvious from the description, or may be learned by
practice of the present invention.
[0014] The foregoing and other aspects of the present invention are
also achieved by providing a display apparatus for communicating
with a computer main body through a DPVL system, wherein the
display apparatus comprises a video signal processor to process a
video signal output from a computer main body into a displayable
video signal, a frame buffer to store frame information
corresponding to the video signal, and a controller to control the
video signal processor to display a picture based on the frame
information stored in the frame buffer when a predetermined
shutdown signal is output from the computer main body, and change
the picture on the basis of the stored frame information when a
predetermined period has elapsed after receiving the shutdown
signal.
[0015] According to an aspect of the present invention, the
controller controls the video signal processor to display the
picture based on the frame information stored in the frame buffer
when the predetermined shutdown signal is output from the computer
main body, and move the picture by a predetermined width or
distance when a predetermined period has elapsed after receiving
the shutdown signal.
[0016] According to an aspect of the present invention, the display
apparatus further comprises a key input part to allow a user to
input a key, and an on screen display (OSD) generator to generate a
position movement menu allowing a user to select a position
movement function for the picture to be turned on and off, and to
further allow a user to set the predetermined period for
implementing the position movement function. The controller
controls the OSD generator to display the position movement menu
when the position movement function is selected through the key
input part, and store setting information that is set through the
position movement menu by manipulating the key input part.
[0017] According to an aspect of the present invention, the
controller controls the video signal processor to move the position
of the displayed picture by a predetermined width or distance after
a lapse of the predetermined period, count the predetermined
period, and then move the position of the displayed picture again
after a lapse of the predetermined period.
[0018] According to an aspect of the present invention, the
controller controls the video signal processor to display the
picture based on the frame information stored in the frame buffer
when the shutdown signal is input, and blink the displayed picture
per a predetermined cycle after the predetermined period has
elapsed.
[0019] The foregoing and other aspects of the present invention are
also achieved by providing a display apparatus for communicating
with a computer main body through a DPVL system, wherein the
display apparatus comprises a video signal processor to process a
video signal output from a computer main body into a displayable
video signal, a frame buffer to store frame information
corresponding to the video signal, and a power supply to supply
power to various circuits provided in the display apparatus. The
display apparatus further comprises a controller to control the
video signal processor to display a picture based on the frame
information stored in the frame buffer when a predetermined
shutdown signal is output from the computer main body, and control
the power supply to interrupt the power supplied to the apparatus
circuits and thus, direct the display apparatus to enter a power
saving mode when a predetermined period has elapsed after receiving
the shutdown signal.
[0020] According to an aspect of the present invention, the display
apparatus further comprises a key input part to allow a user to
input a key, and an OSD generator to generate a power saving
function menu for allowing a user to select the power saving mode
to be turned on and off, and further allows a user to set the
predetermined period for implementing the power saving mode. The
controller controls the OSD generator to display the power saving
function menu when the power saving mode is selected through the
key input part, and store setting information that is set through
the power saving function menu by manipulating the key input
part.
[0021] According to an aspect of the present invention, the OSD
generator generates a message to indicate whether the display
apparatus is in the shutdown state and inform a user of the time
since entering the shutdown state, or the time until entering the
power saving mode. The controller controls the OSD generator to
display the message when a current state of the display apparatus
is asked about by a user through the key input part while the
display apparatus receives the shutdown signal and thus, displays
the picture based on the frame information stored in the frame
buffer.
[0022] The foregoing and other aspects of the present invention are
also achieved by providing a display apparatus for communicating
with a computer main body through a DPVL system, wherein the
display apparatus comprises a video signal processor to process a
video signal output from a computer main body into a displayable
video signal, a frame buffer to store frame information
corresponding to the video signal, an OSD generator to generate a
shutdown message to indicate a shutdown state, and a key input part
to allow a user to input a key. The display apparatus further
comprises a controller to control the OSD generator to display the
shutdown message when a current state of the display apparatus is
asked about by a user through the key input part while the display
apparatus receives the shutdown signal from the computer main body
and thus, displays a picture based on the frame information stored
in the frame buffer.
[0023] According to an aspect of the present invention, the OSD
generator generates a shutdown entering message to indicate
entering the shutdown state, and the controller controls the OSD
generator to display the shutdown entering message for a
predetermined period of time when the shutdown signal is output
from the computer main body.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The above and other aspects and advantages of the present
invention will become apparent and more readily appreciated from
the following description of the embodiments, taken in conjunction
with the accompany drawings, of which:
[0025] FIG. 1 is a control block diagram of a display apparatus
according to a first embodiment of the present invention;
[0026] FIG. 2 is a control flowchart of the display apparatus
according to the first embodiment of the present invention;
[0027] FIG. 3 is a control block diagram of a display apparatus
according to a second embodiment of the present invention;
[0028] FIG. 4 is a control flowchart of the display apparatus
according to the second embodiment of the present invention;
[0029] FIG. 5 is a control block diagram of a display apparatus
according to a third embodiment of the present invention; and
[0030] FIG. 6 is a control flowchart of the display apparatus
according to the third embodiment of the present invention.
[0031] Throughout the drawings, like reference numerals will be
understood to refer to like parts, components and structures.
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
[0032] Reference will now be made in greater detail to embodiments
of the present invention, examples of which are illustrated in the
accompanying drawings, wherein like reference numerals refer to
like elements throughout.
[0033] FIG. 1 is a control block diagram of a display apparatus
according to a first embodiment of the present invention. As shown
therein, a display apparatus according to the first embodiment of
the present invention comprises a display part 20, a frame buffer
36 to store frame information corresponding to a video signal, and
a video signal processor 30 that is controlled by a controller 60
to process the video signal transmitted from a computer main body
(not shown) on the basis of the frame information stored in the
frame buffer 36 so as to be displayed on the display part 20. The
display apparatus further comprises a key input part 50 to allow a
user to input a key, an on screen display (OSD) generator 40 to
generate a position movement menu, and a controller 60 to control
the video signal processor 30 to display a picture based on the
frame information stored in the frame buffer 36 when a
predetermined shutdown signal is input from the computer main body,
and to change the picture on the basis of the stored frame
information after a lapse of a predetermined period from the time
when the shutdown signal is input.
[0034] The video signal processor 30 comprises a scaler 34 to scale
the video signal, and a signal processor 32 to convert an input
video signal to be processed by the scaler 34. Here, the computer
main body communicates with the display apparatus through a digital
connection port (not shown). Further, the signal processor 32
comprises a transition minimized differential signaling (TMDS)
receiver (not shown) to divide a digital video signal, such as a
digital video interface (DVI) signal or the like that is input from
the computer main body through the digital connection port, into
red, green and blue (RGB) digital signals and horizontal/vertical
synchronization signals, and output the signals to the scaler
34.
[0035] The scaler 34 converts the video signal output from the
signal processor 32 into a video signal having a format suitable
for the display part 20. Here, the scaler 34 also moves a display
pixel of a picture that is displayed under the control of the
controller 60, by a predetermined width or distance on the basis of
the frame information of a picture stored in the frame buffer 36.
Thus, the scaler 34 minutely moves and displays a picture. Further,
the scaler 34 can allow a picture that is displayed under the
control of the controller 60 to blink.
[0036] The key input part 50 allows a user to input a key. Here,
the key input part 50 comprises an operation key (not shown)
mounted to a main casing of the display apparatus with a wire-based
configuration, and a remote controller (not shown) for allowing a
user to wirelessly control the display apparatus at a long
distance.
[0037] The OSD generator 40 generates the position movement menu
for allowing a user to selectively turn on and off a position
movement function for a picture, and further allows a user to set a
predetermined period during which the position movement function is
implemented, and outputs the position movement menu to the display
part 20.
[0038] The controller 60 comprises a counter 62 to count an elapsed
time, a memory 64 to store a predetermined setting value, and a
microcomputer 66 to control the scaler 34 to display a picture
based on the frame information stored in the frame buffer 36 when
the shutdown signal is output from the computer main body, and
change a picture on the basis of the stored frame information after
a lapse of a predetermined period from the time when the shutdown
signal is input.
[0039] The microcomputer 66 controls the OSD generator 40 to
display the position movement menu when the position movement
function is selected through the key input part 50. Further, the
microcomputer 66 controls the memory 64 to store an on setting
value when a position movement function for the picture is set to
an on state through the position movement menu as the key input
part 50 is manipulated, and controls the memory 64 to also store
time information input through the position movement menu.
[0040] Here, when the shutdown signal is output from the computer
main body, the microcomputer 66 checks the on setting value stored
in the memory 64, controls the scaler 34 to continuously display a
picture based on the frame information stored in the frame buffer
36, and controls the counter 62 to count an elapsed time.
[0041] At this time, the computer main body enters a link shutdown
state, power saving mode, or power-off state, and does not transmit
the video signal to the display apparatus. Accordingly, the display
apparatus is also in a shutdown state, during which, a still
picture is displayed on the basis of the frame information stored
in the frame buffer 36.
[0042] Here, when the shutdown signal is input to the display
apparatus on the basis of the time information of the memory 64,
and a predetermined setting time (e.g., 20 minutes) based on the
time information has elapsed, the microcomputer 66 controls the
scaler 34 to minutely move the picture on the basis of the stored
frame information. At this time, the microcomputer 66 controls the
scaler 34 to move the picture and at the same time, initializes the
counter 62 to re-count an elapsed time. After a lapse of the
setting time (e.g., 20 minutes), the microcomputer 66 controls the
scaler 34 to again minutely move the picture.
[0043] Therefore, the picture is not displayed as a still picture
on the same pixel for a long period of time in the shutdown state.
Accordingly, there is no afterimage due to the still picture even
though a new picture is not displayed, thereby preventing a
sticking phenomenon from arising.
[0044] Alternatively, when the shutdown signal is input and the
setting time (e.g., 20 minutes) has elapsed, the microcomputer 66
may control the scaler 34 to blink a displayed picture per a
predetermined cycle instead of controlling the scaler 34 to move
the picture, thereby preventing the sticking phenomenon.
Preferably, the cycle is only as short as that required to ensure
that a user is not confused as to the operation being
performed.
[0045] Hereinbelow, a control flowchart of the display apparatus
according to the first embodiment of the present invention will be
described with reference to FIG. 2. At operation S10, a user
selects the position movement function. Accordingly, at operation
S11, the microcomputer 66 controls the OSD generator 40 to display
the position movement menu. At operation S12, when a user sets the
position movement function to the on state through the position
movement menu and inputs the time, the microcomputer 66 controls
the memory 64 to store the on setting value and the set time
information.
[0046] At operation S13, the microcomputer 66 determines whether
the shutdown signal is output from the computer main body. In the
case wherein the shutdown signal is output from the computer main
body, the display apparatus enters the shutdown state at operation
S14, during which, the microcomputer 66 controls the scaler 34 to
display a still picture based on the frame information stored in
the frame buffer 36. At this time, the microcomputer 66 controls
the counter 62 to count the lapsed time. At operation S15, the
microcomputer 66 determines whether the setting time (e.g., 20
minutes) based on the time information stored in the memory 64 has
elapsed.
[0047] When it is determined that the setting time has elapsed, the
microcomputer 66 controls the scaler 34 to minutely move the
picture on the basis of the stored frame information at operation
S16. At operation S17, the microcomputer 66 initializes the counter
62, and at operation S18, determines whether the shutdown state has
been released by receiving the video signal output from the
computer main body. In the case where the shutdown state is
maintained, the microcomputer 66 returns to the operation S14.
[0048] Thus, the same video data is not displayed on the same pixel
for a long period of time so that there is no afterimage, thereby
preventing the sticking phenomenon from arising.
[0049] FIG. 3 is a control block diagram of a display apparatus
according to a second embodiment of the present invention. As shown
therein, a display apparatus according to the second embodiment of
the present invention comprises the display part 20, the frame
buffer 36 to store frame information corresponding to a video
signal, and a video signal processor 30' that is controlled by a
controller 60' to process the video signal transmitted from a
computer main body (not shown) on the basis of the frame
information stored in the frame buffer 36 so as to be displayed on
the display part 20. The display apparatus further comprises the
key input part 50 to allow a user to input a key, a power supply 70
to supply power to various circuits provided in the display
apparatus, an on screen display (OSD) generator 40' to generate a
power saving function menu and a predetermined message, and the
controller 60' to control the video signal processor 30' to display
a picture based on the frame information stored in the frame buffer
36 when a predetermined shutdown signal is output from the computer
main body, and to further control the power supply 70 to enter a
power saving mode after a lapse of a predetermined period from the
time when the shutdown signal is input.
[0050] Hereinafter, elements and descriptions which are
substantially the same with regard to the first embodiment will be
omitted for clarity and conciseness.
[0051] A scaler 34' converts the video signal output from the
signal processor 32 into a video signal having a format suitable
for the display part 20.
[0052] The OSD generator 40' generates a power saving function menu
for allowing a user to turn on and off a power saving mode, set a
period for implementing the power saving mode, and set a
predetermined message to indicate whether the display apparatus is
in the shutdown state and to indicate time remaining before
entering the power saving mode. The OSD generator 40' then outputs
the power saving function menu and the predetermined message to the
display part 20.
[0053] The controller 60' comprises the counter 62 to count an
elapsed time, a memory 64' to store a predetermined setting value,
and a microcomputer 66' to control the scaler 34' to display a
picture based on the frame information stored in the frame buffer
36 when the shutdown signal is output from the computer main body,
and controls the power supply 70 to interrupt the power being
supplied to various circuits provided in the display apparatus
after a lapse of a predetermined period from the time when the
shutdown signal is input.
[0054] The microcomputer 66' controls the OSD generator 40' to
display the power saving function menu when a power saving mode is
selected through the key input part 50. Further, the microcomputer
66' controls the memory 64' to store an on setting value when the
power saving mode is set to an on state through the power saving
mode as the key input part 50 is manipulated, and controls the
memory 64' to also store time information input through the power
saving function menu.
[0055] Here, when the shutdown signal is output from the computer
main body, the microcomputer 66' controls the scaler 34' to
continuously display a picture based on the frame information
stored in the frame buffer 36, and controls the counter 62 to count
an elapsed time. At this time, the computer main body enters a link
shutdown state, power saving mode, or power-off state, and does not
transmit the video signal to the display apparatus. Accordingly,
the display apparatus is also in a shutdown state, during which, a
still picture is displayed on the basis of the frame information
stored in the frame buffer 36.
[0056] Here, when a user asks about a current state of the display
apparatus through the key input part 50, the microcomputer 66'
controls the OSD generator 40' to display a message to inform the
user that the display apparatus displays the still picture while in
the shutdown state, and further displays a message to inform the
user how much time is remaining until the display apparatus enters
the power saving mode on the basis of the counted time of the
counter 62. Further, the microcomputer 66' controls the power
supply 70 to enter the power saving mode when the shutdown signal
is input on the basis of the time information of the memory 64' and
when the setting time (e.g., 30 minutes) has elapsed.
[0057] Therefore, while the display apparatus displays the still
picture based on the frame information of the frame buffer 36 as it
receives the shutdown signal from the computer main body, the
display apparatus displays a corresponding message when a user asks
about the current state of the display apparatus, thereby
preventing a user from being confused as to the operation being
performed. At the same time, the display apparatus enters the power
saving mode, thereby reducing wasteful power consumption.
[0058] Hereinbelow, a control flowchart of the display apparatus
according to the second embodiment of the present invention will be
described with reference to FIG. 4. At operation S20, a user
selects the power saving mode. Accordingly, at operation S21, the
microcomputer 66' controls the OSD generator 40' to display the
power saving function menu. At operation S22, when a user sets the
power saving mode to the on state through the power saving function
menu and inputs the time, the microcomputer 66' controls the memory
64' to store the on setting value and the set time information.
[0059] At operation S23, the microcomputer 66' determines whether
the shutdown signal is output from the computer main body. In the
case wherein the shutdown signal is output from the computer main
body, the display apparatus enters the shutdown state at operation
S24, during which, the microcomputer 66' controls the scaler 34' to
display a still picture based on the frame information stored in
the frame buffer 36. At this time, the microcomputer 66' controls
the counter 62 to count the lapsed time.
[0060] At operation S25, the microcomputer 66' determines whether a
user asks about the current state by manipulating the key input
part 50. When it is determined that a user asks about the current
state by manipulating the key input part 50, the microcomputer 66'
controls the OSD generator 40' to display the message at operation
S26. After the message is displayed or when it is determined that a
user does not ask about the current state through the key input
part 50, the method moves to operation S27. At operation S27, when
the setting time (e.g., 30 minutes) based on the time information
stored in the memory 64' has elapsed after performing the
operations S25 or S26, the microcomputer 66' controls the power
supply 70 to enter the power saving mode at operation S28.
[0061] Thus, while the display apparatus receives the shutdown
signal from the computer main body and displays the still picture
based on the frame information of the frame buffer 36, the display
apparatus displays the corresponding message when a user asks about
the current state of the display apparatus in order to prevent a
user from being confused as to the operation being performed, and
then enters the power saving mode in order to reduce wasteful power
consumption.
[0062] FIG. 5 is a control block diagram of a display apparatus
according to a third embodiment of the present invention. As shown
therein, a display apparatus according to the third embodiment of
the present invention comprises the display part 20, the frame
buffer 36 to store frame information corresponding to a video
signal, and a video signal processor 30'' that is controlled by a
controller 60'' to process the video signal transmitted from a
computer main body (not shown) on the basis of the frame
information stored in the frame buffer 36 so as to be displayed on
the display part 20. The display apparatus further comprises the
key input part 50 to allow a user to input a key, an on screen
display (OSD) generator 40'' to generate a shutdown message to
indicate a shutdown state and a shutdown entering message to
indicate entering the shutdown state, and the controller 60'' to
control the video signal processor 30'' to display a picture based
on the frame information stored in the frame buffer 36 when a
predetermined shutdown signal is output from the computer main
body.
[0063] Hereinafter, elements and descriptions which are
substantially the same with regard to the first and second
embodiments will be omitted for clarity and conciseness.
[0064] The video signal processor 30'' comprises a scaler (not
shown) to scale the video signal, and a signal processor (not
shown) to convert an input video signal to be processed by the
scaler. Here, the computer main body communicates with the display
apparatus through a digital connection port (not shown). Further,
the signal processor comprises a transition minimized differential
signaling (TMDS) receiver (not shown) to divide a digital video
signal, such as a digital video interface (DVI) signal or the like
that is input from the computer main body through the digital
connection port, into red, green and blue (RGB) digital signals and
horizontal/vertical synchronization signals, and to then output the
signals to the scaler.
[0065] The OSD generator 40'' generates the shutdown message to
indicate that the display apparatus is in the shutdown state,
during which the display apparatus displays the still picture, and
the shutdown entering message to indicate that the display
apparatus is entering the shutdown state, and outputs each to the
display part 20.
[0066] The controller 60'' comprises the counter 62 to count an
elapsed time, and a microcomputer 66'' to control the video signal
processor 30'' to display a picture based on the frame information
stored in the frame buffer 36 when the shutdown signal is output
from the computer main body.
[0067] The microcomputer 66'' controls the video signal processor
30'' to display a picture based on the frame information stored in
the frame buffer 36 when the shutdown signal is output from the
computer main body, and controls the counter 62 to count an elapsed
time. At this time, the computer main body enters a link shutdown
state, power saving mode, or power-off state, and does not transmit
the video signal to the display apparatus. Accordingly, the display
apparatus is also in a shutdown state, during which a still picture
is displayed on the basis of the frame information stored in the
frame buffer 36.
[0068] At this time, when the display apparatus receives the
shutdown signal from the computer main body and enters the shutdown
state, the microcomputer 66'' controls the OSD generator 40'' to
display the shutdown entering message to indicate that the display
apparatus is entering the shutdown state. Preferably, the shutdown
entering message disappears after a lapse of a predetermined
period. After the shutdown entering message disappears, the display
apparatus displays the still picture and the microcomputer 66''
controls the OSD generator 40'' to display the shutdown message to
indicate to the user that the display apparatus is in the shutdown
state if the user asks about the current state through the key
input part 50. Preferably, the shutdown message may include the
time (e.g., 1:05) that has elapsed after the display apparatus
entered the shutdown state.
[0069] Thus, the display apparatus according to the third
embodiment of the present invention displays the shutdown entering
message when it receives the shutdown signal from the computer main
body and enters the shutdown state, during which the still picture
is displayed on the basis of the frame information stored in the
frame buffer 36. Thereafter, when a user asks about the current
state of the display apparatus, the display apparatus displays the
shutdown message, thereby preventing a user from being confused
about the operation being performed.
[0070] According to the third embodiment of the present invention,
the display apparatus has a structure to prevent a user from being
confused while the display apparatus receives the shutdown signal
from the computer main body and is in the shutdown state. However,
the display apparatus is not limited to the foregoing structure.
Alternatively, in yet other embodiments of the present invention,
the display apparatus may further comprise the power supply 70 like
that of the second embodiment, and thus enter a power saving mode
when a predetermined period has elapsed from the time when the
shutdown state is started, thereby reducing wasteful power
consumption.
[0071] Thus, each display apparatus according to the foregoing
exemplary embodiments can solve the problems that may arise when
the display apparatus is in the shutdown state. However, the
present invention is not limited to the exemplary embodiments
described above. Alternatively, in yet other embodiments of the
present invention, the display apparatus may have configurations
according to some or all of the first, second and third
embodiments, thereby preventing the sticking phenomenon, the
wasteful power consumption, and a user's confusion.
[0072] Hereinbelow, a control flowchart of the display apparatus
according to the third embodiment of the present invention will be
described with reference to FIG. 6. At operation S30, the
microcomputer 66'' determines whether the computer main body
outputs the shutdown signal. When the shutdown signal is output,
the microcomputer 66'' controls the OSD generator 40'' at operation
S31 to display the entering message to inform a user that the
display apparatus is entering the shutdown state. Preferably, the
entering message disappears after a lapse of a predetermined
period. Thereafter, while in the shutdown state wherein the display
apparatus is displaying a still picture, the microcomputer 66''
determines at operation S33 whether a user asks about the current
state of the display apparatus through the key input part 50. When
it is determined that a user asks about the current state of the
display apparatus through the key input part 50, the microcomputer
66'' controls the OSD generator 40'' to display the shutdown
message to inform a user that the display apparatus is in the
shutdown state. Preferably, the shutdown message may include the
time (e.g., 1:05) that has elapsed since the display apparatus has
entered the shutdown state.
[0073] Thus, the display apparatus according to the third
embodiment of the present invention displays the shutdown entering
message when it receives the shutdown signal from the computer main
body and enters the shutdown state, during which the still picture
is displayed on the basis of the frame information stored in the
frame buffer 36. Thereafter, when a user asks about the current
state of the display apparatus, the display apparatus displays the
shutdown message, thereby preventing a user from being confused as
to the operation being performed.
[0074] As described above, the display apparatus according to the
embodiments of the present invention prevent the image sticking
phenomenon while the display apparatus continuously displays the
still picture in response to the shutdown signal transmitted from
the computer main body. Further, the display apparatus according to
the embodiments of the present invention not only provide various
messages to prevent a user from being confused while the display
apparatus continuously displays the still picture in response to
the shutdown signal transmitted from the computer main body, but
also directs the apparatus to enter a power saving mode after a
lapse of a predetermined time to reduce the wasteful power
consumption.
[0075] Accordingly, the present invention provides a display
apparatus which can decrease an image sticking phenomenon arising
in a shutdown state while displaying a still picture as a shutdown
signal is transmitted from a computer main body to the display
apparatus, reduce wasteful power consumption, and offer various
messages to prevent a user from being confused as to the operation
being performed.
[0076] Although a number of exemplary embodiments of the present
invention have been shown and described herein, it will be
appreciated by those skilled in the art that changes may be made in
these embodiments without departing from the principles and spirit
of the invention, the scope of which is defined in the appended
claims and their equivalents.
* * * * *